Transcript of "Nfc-Full Presentation"

2.
What Is NFC ?
Short range high frequency wireless
communication technology.
Aimed for mobile or handheld devices.
Communication is established by touching the
two device or keeping them in a proximity of a
few centimeters (up to 10 cm) .
Allows communication between Two devices
Initiator and target
-----NFC----MCA-COLLEGE OF ENGINEERING TRIVANDRUM 2

3.
NFC allows two-way communication between endpoints.
It operates frequency band of 13.56 MHz, with a bandwidth of 14
kHz.
Working distance up to 10 cm .
Supported data rates: 106, 212 and 424 Kbit/s
For two devices to communicate using NFC, one device must have
an NFC reader/writer and one must have an NFC tag
Features
-----NFC----MCA-COLLEGE OF ENGINEERING TRIVANDRUM 3

4.
EVOLUTION OF NFC TECHNOLOGY
In 2004, NFC Forum was formed by Nokia, Philips,
Sony, to set standards for NFC . Every NFC enabled
device will have “N-Mark” trademark ,developed by
NFC Forum. N MARK TRADEMARK
In 2006
First mobile
phone( nokia
6131) with NFC
released by
NOKIA.
In 2010
First android
phone SAMSUNG
NEXUS S with
NFC support
released.
-----NFC----MCA-COLLEGE OF ENGINEERING TRIVANDRUM 4

5.
NFC Reader
It is microcontroller-based
with an integrated circuits that is capable of generating
radio frequency at 13.56 MHz . The reader continuously
emits RF signals, and keeps observing the received RF
signals for data.
-----NFC----MCA-COLLEGE OF ENGINEERING TRIVANDRUM 5

6.
NFC Tag
An NFC Tag incorporating a silicon memory chip
connecting to external antenna. Tag does not
have its own power source (passive). The passive
tag absorbs a small portion of the energy emitted
by the reader (phone), and starts sending
modulated information when sufficient energy is
acquired from the RF field generated by the
reader.
-----NFC----MCA-COLLEGE OF ENGINEERING TRIVANDRUM 6

7.
• In Active mode,
both devices with
NFC chip generates
an electromagnetic
field and exchange
data.
Two NFC enabled
devices transfer-ring
data in active mode
 Active mode
•In Passive mode,
there is only one
active device and
the other uses that
field to exchange
information.
 Passive mode
A NFC-enabled mobile
phone is paired with a
RFID-tagged "smart
poster"
-----NFC----MCA-COLLEGE OF ENGINEERING TRIVANDRUM 7

8.
NFC devices communicate via magnetic field induction,
where two antennas are located within each other's near
field, effectively forming an air-core transformer.
The reader continuously generates an RF carrier sine wave (at
13.56 MHz), watching always for modulation to occur.
Detected modulation of the field would indicate the presence
of a tag.
Operation Of NFC
-----NFC----MCA-COLLEGE OF ENGINEERING TRIVANDRUM 8

9.
A tag enters the RF field generated by the reader. Once the tag
has received sufficient energy to operate correctly, it divides
down the carrier and begins clocking its data to an output
transistor, which is normally connected across the coil inputs.
The tag’s output transistor shunts the coil, sequentially
corresponding to the data which is being clocked out of the
memory array.
Shunting the coil causes a momentary fluctuation of the carrier
wave, which is seen as a slight change in amplitude of the carrier.
The reader peak-detects the data and processes the result
according to the Manchester Coding
Operation Of NFC
-----NFC----MCA-COLLEGE OF ENGINEERING TRIVANDRUM 9

16.
ADVANTAGES OF NFC
• High convenience to the user, because the data exchange is
done by bringing two mobiles together.
• Reduces cost of electronic issuance .
• Secure communication.
• No special software.
• No manual configuration and settings.
• No search and pair procedure.
DISADVANTAGES OF NFC
• The system has the limitation that it can be operated only
with devices under a short range i.e. around 10 cm.
• The data transfer rate is very less at about 106kbps, 212 kbps
and 424kbps.
-----NFC----MCA-COLLEGE OF ENGINEERING TRIVANDRUM 16

17.
CONCLUSION
Mobile handsets are the primary
target for NFC and soon NFC will be
implemented in most handheld devices.
Even though NFC have the shortest range
among radio frequency technologies but it
is revolutionary due to it’s security,
compatibility, user friendly interface,
immense applications etc
-----NFC----MCA-COLLEGE OF ENGINEERING TRIVANDRUM 17